<template>
  <div class="icons">
    <swiper :options="swiperOptions">
      <swiper-slide v-for="(page,index) of pages"
                    :key="index">
        <div class="icon"
             v-for="item of page"
             :key="item.id">
          <div class="icon-img">
            <img :src="item.imgUrl"
                 class="icon-imgcontent" />
          </div>
          <p class="icon-desc">{{item.desc}}</p>
        </div>
      </swiper-slide>
    </swiper>
  </div>
</template>

<script>
export default {
  name: 'HomeIcons',
  props: {
    list: Array
  },
  data () {
    return {
      swiperOptions: {
        autoplay: false
      }
    }
  },
  // 因为iconList中的数据过多，没有分页显示而被隐藏起来，这里需要引入一个计算属性
  computed: {
    pages () {
      /* 定义一个数组,作为传递所有item后总共的页数 */
      const pages = []
      /* forEach遍历当前所有传进去的数据    =>是箭头函数，和function（）{}一样 */
      this.list.forEach((item, index) => {
        /* 定义一个数据，计算当前对应下标的数据应该展示在轮播图的第几页     Math.floor()获得整数部分 */
        const page = Math.floor(index / 8)
        if (!pages[page]) {
          pages[page] = []
        }
        pages[page].push(item)
      })
      return pages
    }
  }
}

</script>

<style lang="stylus" scoped>
@import '~styles/varibles.styl'
@import '~styles/mixins.styl'
.icons >>> .swiper-container
  overflow: hidden
  width: 100%
  height: 0
  padding-bottom: 50%
.icon
  position: relative
  overflow: hidden
  float: left
  width: 25%
  height: 0
  padding-bottom: 25%
  .icon-img
    position: absolute
    top: 0
    left: 0
    right: 0
    bottom: 0.44rem
    box-sizing: border-box
    padding: 0.1rem
    .icon-imgcontent
      display: block
      margin: 0 auto
      height: 100%
  .icon-desc
    position: absolute
    left: 0
    right: 0
    bottom: 0
    height: 0.44rem
    line-height: 0.44rem
    text-align: center
    color: $darkTextColor
    ellipsis()
</style>
